<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
            h1{
                display: inline-block;
                width: 200px;
                border-radius: 50%;
            }
        </style>
	</head>
	<body>
        <div style="width: 500px;border:5px solid green">
            <h1 style="border: solid">哈哈哈</h1>
            <h1 style="border: solid">哈哈哈</h1>
            <h1 style="border: solid">哈哈哈</h1>
            <i>哈哈哈</i><i>哈哈哈</i><i>哈哈哈</i>
        </div>
	</body>
</html>